The inventors of a new contactless heart-rate sensor say it could be used to detect people through walls or control artificial limbs. The Electric Potential Sensor (EPS), which was created by researchers at Sussex University and developed by Plymouth-based Plessey Semi- conductors, produces an electrocardiogram (ECG) by measuring changes in the heart's electric field. Where traditional ECG monitors use up to 12 electrodes attached' to the skin with conductive gel, the EPS monitors heart activity using an array of sensors held over the chest, or just two sensors positioned with the heart in the middle-one in each hand, for example.
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